September 25, 2016: Major celebrations have taken place today to mark the end of TBM excavation on the Doha Metro project. The last of 21 Herrenknecht EPBMs engaged on the 56km nework of twin-tube running tunnel excavation broke through to complete a total 112km of segmentally lined infrastructure in 26 months, achieving 2.5km of complete tunnel in one week when all 21 machines were running simultaneously.